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Condensed Matter > Strongly Correlated Electrons
Title: Ground-state phase diagram of the one-dimensional $t$-$J_s$-$J_τ$ model at quarter filling
(Submitted on 13 Dec 2020 (v1), last revised 15 Apr 2021 (this version, v2))
Abstract: We study the ground state of the one-dimensional "$t$-$J_s$-$J_{\tau}$ model," which is a variant of the $t$-$J$ model with additional channel degree of freedom. The model is not only a generalization of the $t$-$J$ model but also an effective model of the two-channel Kondo lattice model in the strong-coupling region. The low-energy excitations and correlation functions are systematically calculated by the density matrix renormalization group method, and the ground-state phase diagram at quarter filling consisting of a Tomonaga-Luttinger liquid, spin-gap state, channel-gap state, insulator, and phase separation is determined. We find that weak channel fluctuations stabilize the spin-gap state, while strong channel fluctuations lead to the transition to the insulator.
Submission history
From: Yuya Kurebayashi [view email][v1] Sun, 13 Dec 2020 01:22:50 GMT (191kb)
[v2] Thu, 15 Apr 2021 15:08:55 GMT (191kb)
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